feat: add Java lang

java-demo/.gitattributes

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+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
+# Binary files should be left untouched
+*.jar           binary
+

java-demo/.gitignore

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+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build

java-demo/app/build.gradle.kts

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+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.12/userguide/building_java_projects.html in the Gradle documentation.
+ */
+
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    application
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // Use JUnit Jupiter for testing.
+    testImplementation(libs.junit.jupiter)
+
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+
+    // This dependency is used by the application.
+    implementation(libs.guava)
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = "org.example.App"
+}
+
+tasks.named<Test>("test") {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+}

java-demo/app/src/main/java/org/example/App.java

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+/*
+ * This source file was generated by the Gradle 'init' task
+ */
+package org.example;
+
+import java.util.concurrent.CompletableFuture;
+
+
+public class App {
+
+    public String a = "a";
+    public String b = "b";
+    public boolean c = false;
+
+    public void aa()
+    {
+        var a = 1;
+        Object b = 2;
+        System.out.println("HEREEEE::" + a);
+        var data = new java.util.HashMap<String, Object>() {{
+            put( "1", 1 );
+            put( "2", 2 );
+        }};
+        var lista = new java.util.ArrayList<Object>(java.util.Arrays.asList(1, 3, 4, "5"));
+        Helpers.GetValue(data, "1");
+        Aux.fix();
+        // System.out.println(a);
+        // System.out.println(data["1"]);
+        // System.out.println(lista[2]);
+        // for (var i = 0; isLessThan(i, getArrayLength(lista)); i++)
+        // {
+        //     System.out.println(lista[i]);
+        // }
+    }
+
+    public void test() {
+        System.out.println("test");
+    }
+
+    public void retryingTask(int... retries) {
+        int n = (retries.length == 0) ? 3 : retries[0];  // default = 3
+        System.out.println("n: " + n);
+        // ...
+    }
+
+    public String getGreeting() {
+        var i = 1;
+        i += 1;
+        var a = "aaa";
+        a += "bbb";
+        // var c = new HashMap<String, String>();
+        return "Hello World222!" + String.valueOf(i) + a;
+    }
+
+    public CompletableFuture<Object> testAsync() {
+        return CompletableFuture.supplyAsync(() -> {
+            try {
+                Thread.sleep(1000); // Simulate a delay
+                throw new RuntimeException("Simulated exception");
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+            }
+            return "Async Result";
+        });
+    }
+
+    public void teste()
+    {
+        Object aaa = (this.fWithParams(3)).join();
+        System.out.println(aaa);
+        var c = this.fWithParams(5);
+    }
+
+    public java.util.concurrent.CompletableFuture<Object> fWithParams(Object a)
+    {
+        return java.util.concurrent.CompletableFuture.supplyAsync(() -> {
+                return 42;
+        });
+
+    }
+
+    public java.util.concurrent.CompletableFuture teste(Object a)
+    {
+        return java.util.concurrent.CompletableFuture.supplyAsync(() -> {
+            System.out.println(a);
+            throw new Error("test") ;
+        });
+
+    }
+
+    public Object getVar(Object v) {
+        return v;
+    }
+
+    public void teste33(String a)
+    {
+        var x = 1;
+        x = 2;
+        Object newObj = new java.util.HashMap<String, Object>() {{
+            put( "a",  App.this.getVar(x) );
+            put( "a",  a );
+            // put( "b", this.getValue(this.getValue(this.getValue(2))) );
+        }};
+        throw new Error("test") ;
+    }
+
+    public java.util.concurrent.CompletableFuture<Object> fetchData(Object input3)
+    {
+        final Object input2 = input3;
+        return java.util.concurrent.CompletableFuture.supplyAsync(() -> {
+            Object input = input2;
+            input = 3;
+            return Helpers.add(input, 2);
+        });
+
+    }
+
+    public java.util.concurrent.CompletableFuture<Object> fetchData(Object input2, Object... optionalArgs)
+    {
+        final Object input3 = input2;
+        return java.util.concurrent.CompletableFuture.supplyAsync(() -> {
+            Object input = input3;
+            System.out.println(input);
+            return null;
+        });
+
+    }
+
+    public static void main(String[] args) {
+        // this.retryingTask();
+
+        var base = 3;
+        System.out.println(new App().getGreeting());
+        var app = new App();
+        app.teste33("example");
+        // app.retryingTask();
+        try {
+            var res = app.testAsync().join();
+            System.out.println("res: " + res);
+        } catch (Exception e) {
+            System.out.println("Error: " + e.getMessage());
+        }
+
+        // System.out.println(app.getGreeting());
+        // app.test();
+        // app.aa();
+        // for (var i = 0; i < 5; ((int) i)++) {
+        //     System.out.println("i: " + i);
+        // }
+    }
+}

java-demo/app/src/main/java/org/example/Aux.java

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+package org.example;
+
+public class Aux {
+
+    public static void fix() {
+        System.out.println("fix");
+    }
+}